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24 Cards in this Set
- Front
- Back
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Platylminthes
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– flatworms that are dorsoventrally flat classes like trematodes (flukes), and cestodes (tapeworms); disease of animals,can lack digestive system.
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Cestodes
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Tapeworms that are intestinal parasites; have a scolex (head),suckers to attach itself. Lack a digestive system. Segmented body of proglottids.
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Trematodes
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Flukes with flat, leaf-shaped bodies, ventral sucker, an oral sucker, one to hold in place and the other to eat. Absorb food through their cuticle.
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Cercaria
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a free-swimming larva of trematodes
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Schistosoma
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blood fluke
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Nematodes
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roundworms, cylindrical, tapered at each end; have a complete digestive system; most species- R- dioecious; males-R-smaller th. females; live in soil, water, plants, and animals
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Dioecious
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– male reproductive organs are in one individual, and female reproductive organs are in another
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Monoecious
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Hermaphroditic; one animal has both male and female reproductive organs
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Miracidium
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the free-swimming, ciliated larva of a fluke that hatches from the egg.
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Redia
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a trematode larval stage that reproduces asexually to produce cercariae
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Metacercariae
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the encysted stage of a fluke in its final intermediate host
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Encyst -
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Formation of a cyst to move from one host cell to another.
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Excyst -
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to emerge form a cyst
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Intermediate host
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an organism that harbors the larval or asexual stage of a helminth or protozoan
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Definitive host –
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– an organism that harbors the aduot, sexually mature form of a parasite
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Scolex
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– the head of a tapeworm, containing suckers and possibly hooks
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Proglottids
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– a body segment of a tapeworm containing both male and female organs
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Hydatid cyst
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– what a larva develops into; this cyst contains “brood capsules” from which thousands of scoleces might be produced
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Clonorchis sinensis
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known as the oriental or Chinese liver fluke
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Paragoniumus werstermani
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eggs are in human lungs, excreted in feces, enters into snail water, enters into crayfish, which are caught and eaten by humans
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Schistosomiasis
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schisto=same body; live in human abdominal cavity, passed from urine or feces into fresh water, infects snail, leaves snail to infect swimming human
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Taenia saginata
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the beef tapeworm; lives in small intestines from a person eating cysticercus in raw or undercooked beef (or pork)
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Taenia solium
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the pork tapeworm
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EXAM 4 CHAPTER 12
HELMINTHS |
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